A university bookstore decreased the price of a sweatshirt from $20 to $18 and discovered that sweatshirt sales increased from 100 per week to 120 per week. Use the midpoint

A university bookstore decreased the price of a sweatshirt from $20 to $18 and discovered that sweatshirt sales increased from 100 per week to 120 per week. Use the midpoint formula to compute the price elasticity of demand for sweatshirts.

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